Nozzle Neck Thickness
The wall thickness of a nozzle neck or other connection should not be less than the thickness computed for the applicable loadings plus the thickness added for corrosion allowance on the connection. Except for access openings and openings for inspection only, it should not be less than the smaller of the following:
1. The minimum thickness of standard wall pipe plus the corrosion allowance on the connection.
2. The required thickness (assuming E = 1)1 of the shell (or head) to which the connection is attached plus the corrosion allowance provided in the shell (or head) adjacent to the connection; but for a welded vessel, in no case, less than 1.16 inches.
The minimum thickness of a pipe is the nominal wall thickness less the 12.5% allowable tolerance.
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